The help file did not work, it just displayed the titles, not the content.
I remember there was a similar issue reported for the RapaGUI help file earlier, then on 32 bit systems.
I think these two problems are closely related.
The resolution I found by googling the problem was this: (do not mind the file name in the quote.)
After doing this the help file worked fine.Right Click on the procmon.chm file and choose 'Properties' from the menu. Then in the general tab, click on Unblock! (You may need to run as an Administrator account to see the unblock item).